Pump



Dec. 16, 1941. L. J. vE'r'RAN`o PUMP original Filed April s, 1956 v 2 sheets-sheet 2 Patented Dec. 16, 1.941

i UNITED STATES PATENT oFFIcE- Leon J. Vetrano, Houston, Tex.4

Application Api-u 3, 193s, serial No. 12,467 Renewed June 19, 1939 This invention relates to a pump. An object of the invention is toA provide a pump having a motor adapted to operate the traveling valve of the pump and to be operated by an opwhereby the traveling valve of the pump will be operated.

'Ihe invention also comprehends a novel type of pilot valve with novel means for actuating the same-whereby the pressure of the operating fluid above the upper plunger may be varied.

' above the upper plunger will be alternately varied The invention also includes a novel type of packing element incorporated into the pump and includes means forA applying the high pressure operating iluid between the cups of the traveling valve and the surrounding walls oi the pump working barrel to exclude deposits oi' sand, grit and the like.

With the above and other objects in' view, the

invention has particular relation to certainnovelfeatures of construction, operation and arrangement or parts, anIk example of which is given in this specification and illustrated in the accompanying drawings. whereinr'r Figure 1 shows a vertical sectional view of the upper end oi the motor. v

Figure 2 shows a vertical sectional view of an intermediate portion thereof.

Figure 3 shows a vertical sectional view, showing the lower portion of the motor and the upper portion of the pump proper.

Figure 4 shows a vertical sectional view of the lower end of the pump.

Figure 5 shows a side elevation partly in section oi the complete apparatus.

Figure 6 shows a side view partly in section of a' packer employed. g

Figure 7 shows a ,transverse sectional view taken on the line 1-1 of Figure 6.

Figure 8 shows a transverse sectional view taken on the line 8--2 oi Figure 1.'

Figure 9 shows a transverse sectional view taken on the line 8 2 of Figure 1.

pistons are connected by a tubular piston rod II Figure 10 shows a transverse sectional view taken on the line Iii-I0 of Figure 1. i

Figure 11 shows a transverse sectional view taken on the line I I-l l of Figure 1.

, Figure 12 shows a transverse sectional viewtaken on the line I2--I2 o! Figure 1. l

Figure 13 shows a side view partly in section of a valve cage employed.

Referring now more particularly to the draw'- ings wherein like numerals of reference designate similar parts in each of the figures. the

numeral I designates the pump tubing which extends to the ground surface and to the lower end of which the motor is connected. 'Ihe operating iluid will be forced down through said4 tubing under the required pressure, entering the space 2. There is a valve cage 3 which is attached to the motor body by means oi' suitable bolts 4 and whose upper end is closed by a plug l. Attached to the lower end of the motor body l is the upper cylinder 1 and attached to the lower end oi' said upper cylinder 'I there is a lower cylinder l having asmaller diameter than the upper cylinder and having a plurality of outlet ports l and above said ports also has the gas vent Il. There is an upper piston l I in the upper cylinder 1 having the downwardly turned cup rings I2 and v there is a lower piston i3 in the lower cylinder I having the upwardly turned cuprings Il. These which is provided with ports il approximately from end to end. An axial tube I8 is attached at its upper end' to the lower fend ofthe body I and its lower vend is extended down into the lower end of the piston rod I6 and is closed by the lower end plate I9.4 Above said plate the tube I8 has outlet ports 20.

The motor body 6 has an axial bore 2| extending from the lower end thereof upwardly to the 40 valve cage 3 and in this bore there is a pilot valve 22 which will be more speciilcally hereinafter described.

A pilot valve rod 2l is attached at its upper end to the lower end of the pilot valve 22 and at its lower end extends through the plate Il and has a flanged nut 2l secured on said extended end and y a coil spring 2li is supported on the iiange oi the nut 2l and surrounds the lower end oi the tube IQ.

ported on the llower piston il and is conned within the piston' rod I8 and its upper end contacts against the ilange of the nut 24 when it reaches its upper position. f The valve 22 has the upper and lower annular grooves 21,-28, forming seats in which the oppositely arranged balls 22 are engageable to hold the pilot valve inl'upper orlower position. The 'balls 29 are urged inwardly by plungers which are seated against the springs 3l and these springs are maintained under' compression by the plugs 32 which are v screwed into the motor body 3.

The plunger assembly I3 is screwed onto the upper end of the tubular plunger rod 33 which extends downwardly through and beneath the cylinder 8 and attached to its lower end there is the traveling valve 34 of the pump which recipro- `ing 39 and through which the high pressure operating fluid may be discharged between the traveling valve and the wall of the working barrel to wash out sand and grit that would otherwise collect therein. The upper end of the pump working barrel 35 is attached to a gland 40 and.

attached'to the lower end oi the cylinder 5 there is a gland 4I which hasLa central downwardly extended sleeve 42 which is secured to the gland 40. Around the sleeve 42 isia bellows 43 which extends from the gland 4I ,to the gland 43. There is a tube 44 whose upper end is connected rwith high pressure operating fluid above the plunger I3 and whose lower end is extended into the upper gland 4I and communicates therein with' a duct 45 which leads downwardly through the walls of the sleeve 42 and terminates in the bellows 43 as shown in Figure 6.

Surrounding said bellows there is an expansible metal protecting sheath 41 and around this sheath is an expansible packer sleeve 43. Upon the application ofhigh pressure operating fluid through the channel 45 the packer assembly of piston II.

the piston I3 is less than the high pressure on the top oi the piston I3 causing both pistons and the' pump traveling valve to move downwardly. As the pistons move downwardly the excess liquid beneath the piston II is transferred under balanced pressure through ports I1, 20, the tube Il, passageway 54, space 53,'channel 52 and valve 591:0 passage 50 and thus back to the upper side When these pistons reach the limit of their downward movement the spring 58 will be compressed exerting a downward thrust on ythe rod 23 and valve 22, unseating the balls 29 permitting the valve 22 to move downwardly until the balls 29 seat in the seat 21 to hold the valve 22 in its lower position and thereby connecting the passage 52a, through the opening 5I with the space 53 which contains operating iluid at high pressure. High pressure fluid is thus on both sides of the piston 54a and there is low pressure above the valve 55a and therefore the valve assembly 54a, 55a, 59, will move upwardly closing the valve 59 and opening the valve 55a. This connects the passage with the space above the .piston I I and with the exhaust channel 52. High pressure liquid is at,al1 times between the pistons II, I3 and causes said pistons and the pump traveling valve 34 to movewupwardly, when the pressureis relieved above piston II through exhaust valve a, because the area exposed to said pressure of the piston I I is greater than that of the piston I3. When the pistons reach the limit of their upward movement the cycle will be again completed-and ready to begin a new cycle.

The balls 29 and spring pressed plungers 30 maintain the pilot valve 22 in its correct position. Should the power be shut ofi' when the valve 22 is in neutral position, upon return of power, leakage of high pressure liquid will pass from the passageway 52 through the hole 53, connected therewith,.llnto the bore 2| above the pilot valve which in turn balances the pilot valve.

above described will be expanded to form a tluid -tight joint with the surrounding well casing 49 K into the passageway 55 through the tube I3. The

lower end of this tube I3 opens into the cylinder 1 through the openings 20 and I1 thereby causing pressure to be always on the lower end of the upper piston I I and against the upper end of the lower piston I3. These pistons, as will be noted. are rigidly connected together by the tubular pumping rod I5 and are rigidly connected to the traveling valve of the pump by the plunger rod 33. As shown in Figures 2 and 3 the pistons II, I3 are at the limit of the upstroke, and spring 25 has been placed under compression and has forced upwardly the valve rod 23 and valve 22. Said valve 22 has communicated the lower part 59 of the cylinder 5I, with the exhaust opening 51, through the passage 52a, thereby relieving the pressure beneath the piston 54a, and said piston has moved downwardly and closed the valve 55a 'and opened the valve 59 admitting the pressure in the chamber 5I to the passage 50 and thereby to the top of the piston II, 'Ihis balances the pressure on both sides of the piston I I. The exhaust pressure on the lower side 0i lThe high pressure liquid passes also through the small vent 54 into the cylinder 55 and causes equalization oi.' pressures on both sides of the piston 54 thereby allowing the spring 55 to move the piston 54 upward and so starting the cycle.

The gas vent I0 in the cylinder 8 is located at the lowest limit of downward movement of the piston I3 so that all gas trapped in the cylinder 3 above said vent will be forced out upon downward movement of said piston. The cylinder 8 will be of considerable' length and the discharge ports 9 will be located at or near the lower end of said cylinder thereby giving ample space for the pumped liquid between the outlet ports 9 'and the gas vent I0. This body of liquid will move the pilot 22 has just been elevated into position to connect the passageway 52a with the exhaust port 51. 'This has relieved the pressure in the lower portion 55 of the cylinder 5I and has caused the valve'59 to open and the valve 55 to close. When the valve 59 opened, high pressure liquid was admitted through the opening 50 into the channel 59 and thence to the top of the upper piston I I thereby balancing the pressure on the top and bottom of the piston II. On account of the low pressure of the pumped liquid beneath the piston I3, the piston assembly is moved downwardly thereby dischargingv the pumped liquid in the cylinder 8 out through the outlets 9 into the Well casing 49 through which ascenso it passes to the ground surface. Upon auch creased and the excess operating iluid between.

the pistons Il and I3 will be transferred, into the top of the cylinder I above the piston Il as hereinabove explained to'be exhausted upon'the next up stroke of the piston assembly; meantime, the traveling valve 34 will have taken in a new charge or load and upon its upward movement this new charge will be elevated andl discharged partly through the outlet openings 9 and part of said load will move up on into the cylinder 8 beneath the piston I3. When the piston assembly reaches the limit of its downward movement the pilot valve 22 will be reversed or moved downwardly closing the port 5l connecting the high pressure channel 53 through the ports 6I and the channel 52a with the lower portion 56 of the cylinder lil thereby causing high pressure liquid to be exerted against the piston 55a to elevate the same' and to close the valve 59 and open the valve 55a. The iiuid from the top of the piston Il is thereby exhausted through the channel 60 and the valve 55a into the passageway 62 and thence to the exhaust port 51 whereby the spent operating fluid will be exhausted into the pumped liquid.

3 The drawings and description disclose what is f now considered to be a preferred form of the invention by way oi' illustration only, while the broad principle o! the invention will be deiined by the appended claims.

What, I claim is:

l. In a pump an upper and a lower cylinder of diii'erent cross sectional areas, a piston in each pressure of the' operating fluid on one side only ot one of the pistons.

2. Pump operating mechanism comprising a 'pair of cylinders or unequal cross sectional areas, a piston in each cylinder, means to connect the pistons against relative movement whereby the pistons will move as a unit, means for delivering an operating iluid under high pressure through one piston into the space between the pistons,`

and means for balancing the pressures on opposite sides of the piston oi.' the larger cross sectional area.

LEON J VE'I'RANO. 

